汽车C柱左下护板顺序阀热流道倒推注塑模设计

Design of fixed demoulding injection mould with sequential valve gating hot runner for door cladding under C⁃pillar of car

根据汽车C柱左下护板的结构特点,设计了一副大型薄壁顺序阀控制的热流道注塑模具。模具采用动模成型外表面,定模成型内表面的倒推模结构,保证了成型塑件外观要求。模具采用双推杆和辅助杆斜顶侧向抽芯机构,解决了斜顶抽芯面积大、抽芯力大以及倾斜角度大的脱模难题。模具采用“直通式水管+倾斜式水管+隔片式水井”近乎随形水路的温度控制系统,水路布置均匀,模具冷却均衡充分,注射周期缩短了约15%,成型塑件尺寸精度达到了MT3(GB/T 14486—2008)。

According to the structural characteristics of the door cladding under C⁃pillar of car,a thin⁃wall injection mold with a sequential valve gating(SVG)hot runner was designed.The appearance of the molded plastic part meets the de⁃sign requirement by employing the mold structure of the outer surface formed by the dynamic mold and the inner surface formed by the fixed mold.The demoulding problem with a large area,a large force and a large inclination angle of in⁃clined top core pulling was solved by using a double guide rod and an auxiliary rod inclined top lateral core pulling mecha⁃nism.The mold adopted a temperature control system based on the straight through water pipe,inclined water pipe,and spacer well,which is close to the shaped water path.The water path was evenly arranged,the mold cooling was bal⁃anced and sufficient,the injection cycle was shortened by about 15%,and the molded plastic parts reached a dimension⁃al accuracy matching the standard of MT3(GB/T 14486—2008).